National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

43°F

6°C

Humidity 89%
Wind Speed Calm
Barometer 30.01 in (1016.4 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 15 Feb 7:53 pm CST
Extended Forecast for

Waterloo IL

Dense Fog Advisory February 15, 11:00pm until February 16, 09:00am
Click here for hazard details and duration
Dense Fog Advisory

  • Tonight

    Tonight: Patchy dense fog after midnight. Otherwise, partly cloudy, with a low around 37. Light and variable wind.

    Low: 37 °F

    Mostly Clear
    then Patchy
    Dense Fog

  • Washington's Birthday

    Washington's Birthday: Patchy dense fog before 8am. Otherwise, mostly sunny, with a high near 65. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 65 °F

    Patchy Dense
    Fog then
    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 43. South wind 6 to 8 mph.

    Low: 43 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 64. South wind 7 to 17 mph, with gusts as high as 28 mph.

    High: 64 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 57. Breezy, with a south wind 16 to 20 mph, with gusts as high as 32 mph.

    Low: 57 °F

    Mostly Cloudy
    and Breezy

  • Wednesday

    Wednesday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 73.

    High: 73 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 40.

    Low: 40 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Tonight
Patchy dense fog after midnight. Otherwise, partly cloudy, with a low around 37. Light and variable wind.
Washington's Birthday
Patchy dense fog before 8am. Otherwise, mostly sunny, with a high near 65. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Monday Night
Partly cloudy, with a low around 43. South wind 6 to 8 mph.
Tuesday
Mostly cloudy, with a high near 64. South wind 7 to 17 mph, with gusts as high as 28 mph.
Tuesday Night
Mostly cloudy, with a low around 57. Breezy, with a south wind 16 to 20 mph, with gusts as high as 32 mph.
Wednesday
Sunny, with a high near 72.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 73.
Thursday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 40.
Friday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 53.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 32.
Saturday
A 20 percent chance of rain. Partly sunny, with a high near 49.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 28.
Sunday
Sunny, with a high near 46.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.33°N 90.16°W (Elev. 600 ft)
Last Update:
7:41 pm CST Feb 15, 2026
Forecast Valid:
8pm CST Feb 15, 2026-6pm CST Feb 22, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation